2007-11-25 18:38:02 +00:00
< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
2009-10-11 16:12:54 +00:00
< title > Associative
Sequence< / title >
2007-11-25 18:38:02 +00:00
< link rel = "stylesheet" href = "../../../../../../../doc/html/boostbook.css" type = "text/css" >
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< meta name = "generator" content = "DocBook XSL Stylesheets V1.65.1" >
2010-01-01 22:00:21 +00:00
=======
< meta name = "generator" content = "DocBook XSL Stylesheets V1.75.1" >
>>>>>>> .merge-right.r57125
2009-09-14 07:47:53 +00:00
< link rel = "home" href = "../../../index.html" title = "Chapter<65> 1.<2E> Fusion 2.0" >
2007-11-25 18:38:02 +00:00
< link rel = "up" href = "../concepts.html" title = "Concepts" >
2009-10-11 16:12:54 +00:00
< link rel = "previous" href = "random_access_sequence.html" title = "Random
Access Sequence">
2007-11-25 18:38:02 +00:00
< link rel = "next" href = "../intrinsic.html" title = "Intrinsic" >
< / head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" > < tr >
< td valign = "top" > < img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../../boost.png" > < / td >
2008-07-17 23:59:40 +00:00
< td align = "center" > < a href = "../../../../../../../index.html" > Home< / a > < / td >
2007-11-25 18:38:02 +00:00
< td align = "center" > < a href = "../../../../../../libraries.htm" > Libraries< / a > < / td >
2008-07-17 23:59:40 +00:00
< td align = "center" > < a href = "http://www.boost.org/users/people.html" > People< / a > < / td >
< td align = "center" > < a href = "http://www.boost.org/users/faq.html" > FAQ< / a > < / td >
2007-11-25 18:38:02 +00:00
< td align = "center" > < a href = "../../../../../../../more/index.htm" > More< / a > < / td >
< / tr > < / table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "random_access_sequence.html" > < img src = "../../../../../../../doc/html/images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../concepts.html" > < img src = "../../../../../../../doc/html/images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../../index.html" > < img src = "../../../../../../../doc/html/images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "../intrinsic.html" > < img src = "../../../../../../../doc/html/images/next.png" alt = "Next" > < / a >
< / div >
2009-10-11 16:12:54 +00:00
< div class = "section" lang = "en" >
< div class = "titlepage" >
< div > < div > < h4 class = "title" >
< a name = "fusion.sequence.concepts.associative_sequence" > < / a > < a href = "associative_sequence.html" title = "Associative
Sequence">Associative
2009-09-14 07:47:53 +00:00
Sequence< / a >
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< / h4 > < / div > < / div >
< div > < / div >
< / div >
< a name = "fusion.sequence.concepts.associative_sequence.description" > < / a > < h5 >
< a name = "id447542" > < / a >
< a href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.description" > Description< / a >
< / h5 >
2010-01-01 22:00:21 +00:00
=======
< / h4 > < / div > < / div > < / div >
< a name = "fusion.sequence.concepts.associative_sequence.description" > < / a > < h6 >
< a name = "id651268" > < / a >
< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.description" > Description< / a >
< / h6 >
>>>>>>> .merge-right.r57125
2007-11-25 18:38:02 +00:00
< p >
An Associative Sequence allows efficient retrieval of elements based on
keys. Like associative sequences in < a href = "http://www.boost.org/libs/mpl/index.html" target = "_top" > MPL< / a > ,
and unlike associative containers in < a href = "http://en.wikipedia.org/wiki/Standard_Template_Library" target = "_top" > STL< / a > ,
Fusion associative sequences have no implied ordering relation. Instead,
2010-01-01 22:00:21 +00:00
type identity is used to impose an equivalence relation on keys.
2007-11-25 18:38:02 +00:00
< / p >
2009-10-11 16:12:54 +00:00
< div class = "variablelist" >
2007-11-25 18:38:02 +00:00
< p class = "title" > < b > Notation< / b > < / p >
< dl >
2009-10-11 16:12:54 +00:00
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > < / span > < / dt >
2007-11-25 18:38:02 +00:00
< dd > < p >
An Associative Sequence
< / p > < / dd >
2009-10-11 16:12:54 +00:00
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > S< / span > < / tt > < / span > < / dt >
2007-11-25 18:38:02 +00:00
< dd > < p >
An Associative Sequence type
< / p > < / dd >
2009-10-11 16:12:54 +00:00
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > K< / span > < / tt > < / span > < / dt >
2007-11-25 18:38:02 +00:00
< dd > < p >
An arbitrary < span class = "emphasis" > < em > key< / em > < / span > type
< / p > < / dd >
2009-10-11 16:12:54 +00:00
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > o< / span > < / tt > < / span > < / dt >
2007-11-25 18:38:02 +00:00
< dd > < p >
An arbitrary object
< / p > < / dd >
2009-10-11 16:12:54 +00:00
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > e< / span > < / tt > < / span > < / dt >
2007-11-25 18:38:02 +00:00
< dd > < p >
A Sequence element
< / p > < / dd >
< / dl >
< / div >
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.sequence.concepts.associative_sequence.valid_expressions" > < / a > < h5 >
< a name = "id447735" > < / a >
< a href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.valid_expressions" > Valid
2010-01-01 22:00:21 +00:00
=======
< a name = "fusion.sequence.concepts.associative_sequence.valid_expressions" > < / a > < h6 >
< a name = "id651402" > < / a >
< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.valid_expressions" > Valid
>>>>>>> .merge-right.r57125
2007-11-25 18:38:02 +00:00
Expressions< / a >
2009-10-11 16:12:54 +00:00
< / h5 >
2007-11-25 18:38:02 +00:00
< p >
For any Associative Sequence the following expressions must be valid:
< / p >
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< col >
< col >
< / colgroup >
< thead > < tr >
2009-10-11 16:12:54 +00:00
< th > < p >
2007-11-25 18:38:02 +00:00
Expression
2009-10-11 16:12:54 +00:00
< / p > < / th >
< th > < p >
2007-11-25 18:38:02 +00:00
Return type
2009-10-11 16:12:54 +00:00
< / p > < / th >
< th > < p >
2007-11-25 18:38:02 +00:00
Type Requirements
2009-10-11 16:12:54 +00:00
< / p > < / th >
< th > < p >
2007-11-25 18:38:02 +00:00
Runtime Complexity
2009-10-11 16:12:54 +00:00
< / p > < / th >
2007-11-25 18:38:02 +00:00
< / tr > < / thead >
< tbody >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/functions/has_key.html" title = "has_key" > < tt class = "computeroutput" > < span class = "identifier" > has_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
< a href = "http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target = "_top" > MPL
Boolean Constant< / a > . Convertible to bool.
2009-10-11 16:12:54 +00:00
< / p > < / td >
< td > < p >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Constant
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/functions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Any type
2009-10-11 16:12:54 +00:00
< / p > < / td >
< td > < p >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Constant
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/functions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span >
< span class = "special" > =< / span > < span class = "identifier" > o< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Any type
2009-10-11 16:12:54 +00:00
< / p > < / td >
< td > < p >
< tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > is mutable and
< tt class = "computeroutput" > < span class = "identifier" > e< / span > < span class = "special" > =< / span >
< span class = "identifier" > o< / span > < / tt > , where < tt class = "computeroutput" > < span class = "identifier" > e< / span > < / tt > is the first element in the
2007-11-25 18:38:02 +00:00
sequence, is a valid expression.
2009-10-11 16:12:54 +00:00
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Constant
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< / tbody >
< / table > < / div >
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.sequence.concepts.associative_sequence.result_type_expressions" > < / a > < h5 >
< a name = "id448116" > < / a >
< a href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.result_type_expressions" > Result
2010-01-01 22:00:21 +00:00
=======
< a name = "fusion.sequence.concepts.associative_sequence.result_type_expressions" > < / a > < h6 >
< a name = "id651688" > < / a >
< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.result_type_expressions" > Result
>>>>>>> .merge-right.r57125
2007-11-25 18:38:02 +00:00
Type Expressions< / a >
2009-10-11 16:12:54 +00:00
< / h5 >
2007-11-25 18:38:02 +00:00
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
2009-10-11 16:12:54 +00:00
< th > < p >
2007-11-25 18:38:02 +00:00
Expression
2009-10-11 16:12:54 +00:00
< / p > < / th >
< th > < p >
2007-11-25 18:38:02 +00:00
Compile Time Complexity
2009-10-11 16:12:54 +00:00
< / p > < / th >
2007-11-25 18:38:02 +00:00
< / tr > < / thead >
< tbody >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/has_key.html" title = "has_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > has_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span >
< span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Amortized constant time
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span >
< span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Amortized constant time
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/value_at_key.html" title = "value_at_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span >
< span class = "identifier" > K< / span > < span class = "special" > > ::< / span > < span class = "identifier" > type< / span > < / tt >
< / p > < / td >
< td > < p >
2007-11-25 18:38:02 +00:00
Amortized constant time
2009-10-11 16:12:54 +00:00
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< / tbody >
< / table > < / div >
2009-10-11 16:12:54 +00:00
< div class = "sidebar" > < p >
< span class = "inlinemediaobject" > < img src = "images/note.png" alt = "note" > < / span > < tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > K< / span > < span class = "special" > > < / span > < / tt > returns the actual type returned by
< tt class = "computeroutput" > < a href = "../intrinsic/functions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt > . In
2007-11-25 18:38:02 +00:00
most cases, this is a reference. Hence, there is no way to know the exact
2009-10-11 16:12:54 +00:00
element type using < tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > K< / span > < span class = "special" > > < / span > < / tt > .The element at < tt class = "computeroutput" > < span class = "identifier" > K< / span > < / tt >
2007-11-25 18:38:02 +00:00
may actually be a reference to begin with. For this purpose, you can use
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< tt class = "computeroutput" > < a href = "../intrinsic/metafunctions/value_at_key.html" title = "value_at_key" > < tt class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > < / span > < / tt > .
< / p > < / div >
< a name = "fusion.sequence.concepts.associative_sequence.expression_semantics" > < / a > < h5 >
< a name = "id448687" > < / a >
< a href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.expression_semantics" > Expression
2010-01-01 22:00:21 +00:00
=======
< code class = "computeroutput" > < a class = "link" href = "../intrinsic/metafunctions/value_at_key.html" title = "value_at_key" > < code class = "computeroutput" > < span class = "identifier" > result_of< / span > < span class = "special" > ::< / span > < span class = "identifier" > value_at_key< / span > < / code > < / a > < span class = "special" > < < / span > < span class = "identifier" > S< / span > < span class = "special" > ,< / span > < span class = "identifier" > N< / span > < span class = "special" > > < / span > < / code > .
< / p >
< / div >
< a name = "fusion.sequence.concepts.associative_sequence.expression_semantics" > < / a > < h6 >
< a name = "id652092" > < / a >
< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.expression_semantics" > Expression
>>>>>>> .merge-right.r57125
2007-11-25 18:38:02 +00:00
Semantics< / a >
2009-10-11 16:12:54 +00:00
< / h5 >
2007-11-25 18:38:02 +00:00
< div class = "informaltable" > < table class = "table" >
< colgroup >
< col >
< col >
< / colgroup >
< thead > < tr >
2009-10-11 16:12:54 +00:00
< th > < p >
2007-11-25 18:38:02 +00:00
Expression
2009-10-11 16:12:54 +00:00
< / p > < / th >
< th > < p >
2007-11-25 18:38:02 +00:00
Semantics
2009-10-11 16:12:54 +00:00
< / p > < / th >
2007-11-25 18:38:02 +00:00
< / tr > < / thead >
< tbody >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/functions/has_key.html" title = "has_key" > < tt class = "computeroutput" > < span class = "identifier" > has_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
A boolean Integral Constant < tt class = "computeroutput" > < span class = "identifier" > c< / span > < / tt >
such that < tt class = "computeroutput" > < span class = "identifier" > c< / span > < span class = "special" > ::< / span > < span class = "identifier" > value< / span > < span class = "special" > ==< / span >
< span class = "keyword" > true< / span > < / tt > if and only if there
is one or more elements with the key < tt class = "computeroutput" > < span class = "identifier" > k< / span > < / tt >
in < tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > ; see < a href = "../intrinsic/functions/has_key.html" title = "has_key" > < tt class = "computeroutput" > < span class = "identifier" > has_key< / span > < / tt > < / a > .
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< tr >
2009-10-11 16:12:54 +00:00
< td > < p >
< tt class = "computeroutput" > < a href = "../intrinsic/functions/at_key.html" title = "at_key" > < tt class = "computeroutput" > < span class = "identifier" > at_key< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "identifier" > K< / span > < span class = "special" > > (< / span > < span class = "identifier" > s< / span > < span class = "special" > )< / span > < / tt >
< / p > < / td >
< td > < p >
The element associated with the key < tt class = "computeroutput" > < span class = "identifier" > K< / span > < / tt >
in the sequence < tt class = "computeroutput" > < span class = "identifier" > s< / span > < / tt > ;
see < a href = "../intrinsic/functions/at.html" title = "at" > < tt class = "computeroutput" > < span class = "identifier" > at< / span > < / tt > < / a > .
< / p > < / td >
2007-11-25 18:38:02 +00:00
< / tr >
< / tbody >
< / table > < / div >
2010-01-01 22:00:21 +00:00
< < < < < < < .working
2009-10-11 16:12:54 +00:00
< a name = "fusion.sequence.concepts.associative_sequence.models" > < / a > < h5 >
< a name = "id449008" > < / a >
< a href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.models" > Models< / a >
< / h5 >
< div class = "itemizedlist" > < ul type = "disc" >
< li > < a href = "../../container/set.html" title = "set" > < tt class = "computeroutput" > < span class = "identifier" > set< / span > < / tt > < / a > < / li >
< li > < a href = "../../container/map.html" title = "map" > < tt class = "computeroutput" > < span class = "identifier" > map< / span > < / tt > < / a > < / li >
2010-01-01 22:00:21 +00:00
=======
< a name = "fusion.sequence.concepts.associative_sequence.models" > < / a > < h6 >
< a name = "id652312" > < / a >
< a class = "link" href = "associative_sequence.html#fusion.sequence.concepts.associative_sequence.models" > Models< / a >
< / h6 >
< div class = "itemizedlist" > < ul class = "itemizedlist" type = "disc" >
< li class = "listitem" > < a class = "link" href = "../../container/set.html" title = "set" > < code class = "computeroutput" > < span class = "identifier" > set< / span > < / code > < / a > < / li >
< li class = "listitem" > < a class = "link" href = "../../container/map.html" title = "map" > < code class = "computeroutput" > < span class = "identifier" > map< / span > < / code > < / a > < / li >
>>>>>>> .merge-right.r57125
2007-11-25 18:38:02 +00:00
< / ul > < / div >
< / div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
< td align = "left" > < / td >
< td align = "right" > < div class = "copyright-footer" > Copyright <20> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
< / p >
< / div > < / td >
< / tr > < / table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "random_access_sequence.html" > < img src = "../../../../../../../doc/html/images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../concepts.html" > < img src = "../../../../../../../doc/html/images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../../index.html" > < img src = "../../../../../../../doc/html/images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "../intrinsic.html" > < img src = "../../../../../../../doc/html/images/next.png" alt = "Next" > < / a >
< / div >
< / body >
< / html >
